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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Compensation Cost
The following table summarizes the stock-based compensation expense for restricted stock (in thousands):
Year Ended December 31,
Line Item202120202019
Advisory services fee$3,028 $2,672 $2,468 
Management fees56 133 155 
Corporate general and administrative 111 71 72 
Corporate general and administrative - independent directors322 130 208 
$3,517 $3,006 $2,903 
The following table summarizes the compensation expense for PSUs (in thousands):
Year Ended December 31,
Line Item202120202019
Advisory services fee$3,374 $2,695 2,439 
Summary of Restricted Stock Activity
A summary of our restricted stock activity is as follows (shares in thousands):
Year Ended December 31,
202120202019
Number of UnitsWeighted Average
Price at Grant		Number of UnitsWeighted Average
Price at Grant		Number of UnitsWeighted Average
Price at Grant
Outstanding at beginning of year536 $7.98 497 $11.89 441 $10.91 
Restricted shares granted764 7.02 359 4.13 261 12.68 
Restricted shares vested(317)6.31 (310)9.81 (198)10.75 
Restricted shares forfeited(26)6.94 (10)7.25 (7)11.59 
Outstanding at end of year957 $6.94 536 $7.98 497 $11.89 
Summary of PSUs Activity
A summary of our PSU activity is as follows (shares in thousands):
Year Ended December 31,
202120202019
Number of UnitsWeighted Average Price at GrantNumber of UnitsWeighted Average Price at GrantNumber of UnitsWeighted Average Price at Grant
Outstanding at beginning of year448 $11.71 420 $16.91 316 $12.29 
PSUs granted446 7.01 225 3.51 223 19.96 
PSUs canceled(223)19.96 (197)13.43 (119)10.42 
Outstanding at end of year671 $5.84 448 $11.71 420 $16.91